Monitoring and Environmental Surveillance (DOE/EH-0173T), "the linear flow rate across particulate filters and charcoal cartridges should be maintained between 20 and 50 m/minute (DOE/EP-0023)."

Radioactive Noble gas

"What is the retention efficiency of Radio Iodine or Xenon on Carbon and Silver Zeolite?" The reason the question is asked, is because 133Xe is also a by-product of nuclear fission. In the Journal of Health Physics, it is stated that when Carbon and Silver Zeolite are dosed with 133I and 133Xe, tests show that 0.03 to 0.5% of the original concentration of 133Xe will be retained on 40x50 mesh TEDA impregnated carbon. Silver impregnated Zeolite was found to have retained 1/15,000th the amount of 133Xe as that of the Carbon. The lower the retention or capture of 133Xe on a collection media such as silver zeolite, the lower the possibility of misinterpretation of collected radioactivity as being attributed to anything other than the iodine species.

HI-Q stands for High Quality!

HI-Q manufactures all of its cartridges under an ISO 9001:2000 certified quality assurance program. Following the set procedures set forth in their Quality Assurance Program ensures repeatable performance and dimensions of each cartridge manufactured by HI-Q Environmental Products Company. HI-Q specifically has each individual lot of carbon and silver zeolite, from which the individual cartridges are made, randomly tested and certified by an independent testing laboratory, at multiple sample flow rate points through the most common geometry of cartridges utilized in the nuclear industry. The Lot-Specific test results are included with each customer order.

The individually labeled cartridges are heat-sealed in air tight 6 mil polyethylene packages or sleeves. Silver Impregnated Zeolite cartridges are packaged individually and TEDA Impregnated Carbon cartridges are packaged in sleeves of 10. Custom packaging configurations are available upon request. Shelf life of the sealed cartridges as defined by the industry is 10 years.

What mesh size media should you use?

HI-Q has three mesh sizes of impregnated Carbon available. They are: 8 x 16, 20 x 40 and 30 x 50 Mesh. These three Mesh sizes are made available because sampling requirements vary, depending on, flow rate, sampling duration, sampling equipment type, Iodine specie, etc. As a rule, the smaller the physical mesh size (i.e. 30 x 50), the higher the Iodine retention efficiencies, but the greater the pressure drop through the filter cartridge (smaller size materials present a greater surface area allowing higher gas to surface contact). Because of the high pressure drop, it is recommended however that the very fine 30 x 50 Mesh cartridges only be used in positive displacement pump systems, NOT high volume centrifugal fan or battery operated pump samplers.Monitoring and Environmental Surveillance (DOE/EH-0173T), "the linear flow rate across particulate filters and charcoal cartridges should be maintained between 20 and 50 m/minute (DOE/EP-0023)."

TEDA Impregnated Carbon Cartridges

TEDA (triethylene di-amine) impregnated Carbon filter media has a high affinity for the adsorption, chelation and retention of the various species of Iodine. The HI-Q Environmental Products Company manufactures a number of configurations of activated carbon cartridges to fit almost all industry standard cartridge holders. The most common size in the industry is the 2¼" dia. x 1" thick unit. These are HI-Q's "TC-Series" cartridges. This cartridge container is made of radiation yellow, high density polypropylene which is chemically inert, with a spun polypropylene retainer. The cartridges are easily cut open for analysis. Other popular HI-Q cartridge configurations, are the 2½" dia. x 1" (TCAL-Series), and the 2½" dia. x 1½" (TCGA-Series) metal can configuration commonly used in post accident monitors. All cartridges are heat-sealed in an airtight 6-mil polyethylene package to prevent contamination before use. The unopened package has an industry accepted ten-year shelf life. Ten cartridges are contained in each package/sleeve. Custom packaging is available with no minimum order.